How to Disappear Completely (2019)

Following the disappearance of her son, Marie decides to cut herself off completely from the outside world. Holed up in her flat for days at a time, her only human contact comes in the form of nightly conversations with a call centre worker who becomes convinced that her son may not be so far away after all. When Marie notices small changes around her flat she starts questioning her reality and determines to find a way out of the darkness.